In recent years, in the global power system fire accident, due to the fire of the wire and cable, the proportion of power supply interruptions in power systems has a rise. Therefore, in places with a large amount of electrical equipment and densely laid a large number of cables such as power plants and substations, flame retardant cables and fire resistant wire which are used to prevent the spread of fire from spreading and to ensure that important circuit power supply are increasingly important. Some electrical designers are unable to distinguish the concepts of flame retardant cables and fire resistant wires, and they do not know the structure and characteristics of these two cables, which causes them to be unable to correctly design and choose these two cables according to the power supply requirements. During the supervision work, we cannot correctly guide the laying and construction of these two cables. Therefore, comprehensive and correct understanding of flame retardant and fire resistant cables are the primary conditions to correctly choose them.
Flame retardant cable:
The flame retardant cable refers to: under the specified test conditions, the sample is burned. After the evacuation of the test fire source, the spread of the flame only occurs within the limited range, and the cables that can be extinguished by themselves within a limited time. Its fundamental characteristic is that it may be burned and unable to operate under the fire, but it can prevent the spread of the fire. In layman's terms, the cable can limit the combustion to the limited area, without spreading, keeping other various equipment safe, and avoiding greater losses.
According to the provisions of the "Test method on electric wires or cables under fire condition", the flame-retardant cables that adopt a bundled cable burning test method can be divided into 3 categories of A, B, and C. Among them, the Type A cable test conditions are the most harsh, the performance is better than the B and C categories, and the price is the most expensive.
In order to realize the flame retardant level of the cable or increase the flame retardant level of the cable, people have developed the so-called "oxygen-proof layer" or "fireproof layer" as a new type structure of cable such as filling or waging fireproof flame retardant band (fireproof layer), and we call it the "oxygen-proof (fireproof) layer" cable.
Dongguan Zonsky Instrument (fireproof flame retardant quality inspection equipment, wire and cable inspection equipment experts, focusing on the quality Testing Equipment industry for nearly 20 years)
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